I use one of the larger trolley type weed wands on several long gravel paths. It works very well and after a couple of goes the weeds do subside very substantially.
As it doesn't kill the roots its a bit of an ongoing process and I haven't been doing it long enough to know whether it really is controlling the spread of weeds.
It is extremely good fun but having said that there is a significant risk of setting fire to the garden.
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